r17342: implement a SamLogon via IRPC in samba4's winbind

metze
(This used to be commit c3ce7a0c3708f0c8e784404e86034f7a00685f88)

1 files changed, 168 insertions, 0 deletions

diff --git a/source4/winbind/wb_sam_logon.c b/source4/winbind/wb_sam_logon.c
new file mode 100644
index 0000000000..7906f3f525
--- /dev/null
+++ b/source4/winbind/wb_sam_logon.c
@@ -0,0 +1,168 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   Do a netr_LogonSamLogon to a remote DC
+
+   Copyright (C) Volker Lendecke 2005
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+   Copyright (C) Stefan Metzmacher 2006
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "libcli/composite/composite.h"
+#include "winbind/wb_server.h"
+#include "smbd/service_task.h"
+#include "libcli/auth/credentials.h"
+#include "libcli/auth/libcli_auth.h"
+#include "librpc/gen_ndr/ndr_netlogon.h"
+#include "librpc/gen_ndr/ndr_netlogon_c.h"
+#include "librpc/gen_ndr/winbind.h"
+
+struct wb_sam_logon_state {
+	struct composite_context *ctx;
+
+	struct winbind_SamLogon *req;
+
+        struct creds_CredentialState *creds_state;
+        struct netr_Authenticator auth1, auth2;
+
+	TALLOC_CTX *r_mem_ctx;
+        struct netr_LogonSamLogon r;
+};
+
+static void wb_sam_logon_recv_domain(struct composite_context *ctx);
+static void wb_sam_logon_recv_samlogon(struct rpc_request *req);
+
+/*
+    Find the connection to the DC (or find an existing connection)
+*/
+struct composite_context *wb_sam_logon_send(TALLOC_CTX *mem_ctx,
+					    struct wbsrv_service *service,
+					    struct winbind_SamLogon *req)
+{
+	struct composite_context *c, *creq;
+	struct wb_sam_logon_state *s;
+
+	c = composite_create(mem_ctx, service->task->event_ctx);
+	if (!c) return NULL;
+
+	s = talloc_zero(c, struct wb_sam_logon_state);
+	if (composite_nomem(s, c)) return c;
+	s->ctx = c;
+	s->req = req;
+
+	c->private_data = s;
+
+	creq = wb_sid2domain_send(s, service, service->primary_sid);
+	composite_continue(c, creq, wb_sam_logon_recv_domain, s);
+	return c;
+}
+
+/*
+    Finish the connection to the DC
+    Send of a SamLogon request to authenticate a user.
+*/
+static void wb_sam_logon_recv_domain(struct composite_context *creq)
+{
+	struct wb_sam_logon_state *s = talloc_get_type(creq->async.private_data,
+				       struct wb_sam_logon_state);
+	struct rpc_request *req;
+	struct wbsrv_domain *domain;
+
+	s->ctx->status = wb_sid2domain_recv(creq, &domain);
+	if (!composite_is_ok(s->ctx)) return;
+
+	s->creds_state = cli_credentials_get_netlogon_creds(domain->schannel_creds);
+	creds_client_authenticator(s->creds_state, &s->auth1);
+
+	s->r.in.server_name = talloc_asprintf(s, "\\\\%s",
+			      dcerpc_server_name(domain->netlogon_pipe));
+	if (composite_nomem(s->r.in.server_name, s->ctx)) return;
+
+	s->r.in.computer_name = cli_credentials_get_workstation(domain->schannel_creds);
+	s->r.in.credential = &s->auth1;
+	s->r.in.return_authenticator = &s->auth2;
+	s->r.in.logon_level = s->req->in.logon_level;
+	s->r.in.logon = s->req->in.logon;
+	s->r.in.validation_level = s->req->in.validation_level;
+	s->r.out.return_authenticator = NULL;
+
+	/*
+	 * use a new talloc context for the LogonSamLogon call
+	 * because then we can just to a talloc_steal on this context
+	 * in the final _recv() function to give the caller all the content of
+	 * the s->r.out.validation
+	 */
+	s->r_mem_ctx = talloc_new(s);
+	if (composite_nomem(s->r_mem_ctx, s->ctx)) return;
+
+	req = dcerpc_netr_LogonSamLogon_send(domain->netlogon_pipe, s->r_mem_ctx, &s->r);
+	composite_continue_rpc(s->ctx, req, wb_sam_logon_recv_samlogon, s);
+}
+
+/* 
+   NTLM Authentication 
+   
+   Check the SamLogon reply and decrypt the session keys
+*/
+static void wb_sam_logon_recv_samlogon(struct rpc_request *req)
+{
+	struct wb_sam_logon_state *s = talloc_get_type(req->async.private,
+				       struct wb_sam_logon_state);
+
+	s->ctx->status = dcerpc_ndr_request_recv(req);
+	if (!composite_is_ok(s->ctx)) return;
+
+	s->ctx->status = s->r.out.result;
+	if (!composite_is_ok(s->ctx)) return;
+
+	if ((s->r.out.return_authenticator == NULL) ||
+	    (!creds_client_check(s->creds_state,
+				 &s->r.out.return_authenticator->cred))) {
+		DEBUG(0, ("Credentials check failed!\n"));
+		composite_error(s->ctx, NT_STATUS_ACCESS_DENIED);
+		return;
+	}
+
+	/* Decrypt the session keys before we reform the info3, so the
+	 * person on the other end of winbindd pipe doesn't have to.
+	 * They won't have the encryption key anyway */
+	creds_decrypt_samlogon(s->creds_state,
+			       s->r.in.validation_level,
+			       &s->r.out.validation);
+
+	composite_done(s->ctx);
+}
+
+NTSTATUS wb_sam_logon_recv(struct composite_context *c,
+			   TALLOC_CTX *mem_ctx,
+			   struct winbind_SamLogon *req)
+{
+	struct wb_sam_logon_state *s = talloc_get_type(c->private_data,
+				       struct wb_sam_logon_state);
+	NTSTATUS status = composite_wait(c);
+
+	if (NT_STATUS_IS_OK(status)) {
+		talloc_steal(mem_ctx, s->r_mem_ctx);
+		req->out.validation	= s->r.out.validation;
+		req->out.authoritative	= 1;
+		req->out.flags		= 0;
+	}
+
+	talloc_free(s);
+	return status;
+}